.checked {
  background-color: #d61712;
  color: white;
}
.first {
  width: 20%;
  margin-left: 3%;
  height: 40px;
  line-height: 40px;
  font-size: 20px;
  border: 0.5px solid black;
  float: left;
  text-align:center;
  border-radius:2px ;
}
#state {
  overflow: hidden;
  width: 80%;
  margin-left: 10%;
}
.OP {
  display: inline-block;
  width: 100px;
  text-align:center;
  margin-right: 5px;
}
.findBackWord {
  width: 80% ;
  margin-left: 10%;
  border-bottom: 0.2px solid black;
  padding: 20px;
}
b {
  display: inline-block;
  margin-right: 10px;
  font-size: 20px;
}
#findBackCode {
  width: 80px;
}
.middle {
  width: 300px;
  position: relative;
  left: 50%;
  margin-left: -150px;
  margin-top: 100px;
}
#second {
  display: none;
}
#third {
  display: none;
}
#fourth {
  display: none;
}
.btn{
  margin-left: 33%;
  margin-top: 20px;
  display: inline-block;
  width: 100px;
  height: 30px;
  background: #f5501e;
  font-size: 20px;
  color: white;
  border: none;
}